I wanted a USB power pack that took AA batteries as I have loads of AA rechargeable. This device works fine and has a built in regulator to maintain the correct voltage. Using a set of 2900mah batteries from Seven Day Shop, it charged my tablet from nearly flat with enough power left to give a part charge to my smart phone. It should be born in mind that these types of charges are only around 70 % efficient so you will only get around 2000mah from a 2900mah set of rechargeable.
When you first plug it into your phone to charge there is a blue LED around the USB socket which turns to red when the batteries are getting low. It will cut off the power before the batteries are completely drained.
Added bonus is if you are away from home and need to charge the phone, you can buy AA virtually anywhere to get you out of trouble.
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